#include<iostream>
using namespace std;
int main(){
	int budget[12];
	int now = 0;
	int mom = 0;
	int bankruptcyTime = 1;
	for(int i = 0;i < 12;i++){
		cin>>budget[i];
		now += 300 - budget[i];
		if(now < 0){
			bankruptcyTime = 0 - (i + 1);
		}
		mom += now / 100;
		now %= 100;
	}
	if(bankruptcyTime == 1){
		cout<<mom * 120 + now;
		return 0;
	}
	cout<<bankruptcyTime;
	return 0;
}

C++11代码

未开O2优化

#6 和 #8 不过